Many of the chemicals in sunscreens are known carcinogens and are also endocrine disrupting chemicals (EDC). Not a good thing! These EDCs have properties that disrupt hormones, meaning that they can (and do) alter male/female sex differentiation, causing men’s breasts to grow, impacting brain development, disrupting thyroid function and even impacting both male and female fertility. Testing has shown that 97% of Americans (even newborns) have sunscreen chemicals in their blood. This summer, play it safe by opting for chemical-free sunscreens. My favorite is Third Rock Essentials.